I want`to change all the oil in the rear differensial on my Q4 before starting to use the car.
Is there any smart/easy way to do this, and which oil do people use on this car? Seems pretty difficult to meassure and get 1,135 litres into a little hole under the car

alf@75 said:
The picture you have ther are from the manual i`m missing, do you have the hole thing?

Do I have to use the Tutela make, or any make with the right viscosity?
Is it difficult to do this operation?

I suppose you and me has the same problem, we can get really cold weather. The Tutela W 90 M-DA pour point is
-27 and i dont feel safe to move the car if outside temp is around the same. When i got mine changed i went for Castrol SAF-XO its a 75W-90W GL5 oil, pour point -51. For the visco Tutela GI/A is ok, pour point -40.The Tutela Gemax 6 GL4 special in the gearbox is a mineral 80W oil with pour point -27. Its not available anymore. I got Castrol SMX-S 75W-80W when got a change last time,but it feels a bit to light. I think will go for Tutela Technyx 75W-85W pour point -40 next time, i put that in my 146 Ti last spring and it made a big differece to the gearbox. If you are changing the servo oil, the old oil is Tutela GI/R, its a CHF mineral oil called 7.1 the new Tutela GI/R is a CHF synthetic oil called 11S they ar not mixable. I use Citroen LHM+ which is the same as the CHF 7.1. Dont forget to change the filter if you change servo oil. This guy in Finland has the complete Tutela/Selenia range.heikka.fi

I didnt find any better topic for my question and I dont want to make a new topic if there are a simple anwer to my needs: I think my Q4 rear differential is jamming. For example sometimes when I reverse from the parking lot and turn when reversing, I hear a gravel grisling under the rear wheels and the car doesnt want to move. Then suddenly a loud "TUMB"-sound (and brown stripe in my underwear) and the car moves again easily. Is the only option to tear apart the rear torsen? In my mind there is no other way to fix this behaviour. Has anyone ever had same problems?

From what I recall reading about the Viscomatic, some of the oil compartments are closed, so not possible to change oil. If you have replaced the fluids where possible, this might be the last option. Without having heard the sound and behaviour, it is not easy to pin point, but what ever you find out, it will be good to know about.